Regulating device for the keys of calculating-machines.



H. CORDT. REGULATIIIG DEVICE FOR. THE KEYS OP CALCULATING MACHINES.

APPLICATION FILED FEB.16,1914.

1.1 i 9,404. Patented Dec. 1, 1914.

HUGO CORD'l, OF OLDENBURG, GERMANY.

REGULATING DEVICE FOR THE KEYS OF CALCULATING-BMCHINES.

l il

Specification of Letters Patent.

Patented Dec. 31, 1914.

Application filed February 16, 3914. Serial No. 5518,9802.

r 0 tall whom it may concern Be it known that l, HUGO Comm, 3. subject of the Grand Duke of Oldenburg, residat Oldenburg, in the Grand Duchy of Oldenburg, German Empire, have invented certain new and useful Improvements in Regulating Devices for the Keys of Calculating-Heel ines, ofivliich the following is a specific -ii here have already become known regulosing devices for the keys of calculating machines which comprise a regulating wheel. There have further been proposed dif .enl: devices for insuring as uniform a sir-eke as possible. Although the keys are usually made very long it is not possible to obtain absolutely uniform stroke of the keys. One of the inconveniences connected with devices of known construction is the: egrect part of the movement of the kev is idle so that with every key a certain pressure has to be exerted without counter pres sure before the stronger pressure can he applied owing to iho fact thatthe levers are operated only lay-resistance. It therefore happens sometimes that the person Who manipulates the calculating machine mistakes the resistance of the lovers for the operating pressure so that mistakes occur.

According lo the invention the levers are operated from the beginning of the depression of any of the keys so that from the beginning oi she depression of the key a counpressure is produced. lccording to the invention 2. lever is pivofielly mounted under the keys, one end of said lever being connected with the regulating wheel she other free end of said lever extending under the keys and being" curved in such a manner that the keys which rest on said lever have a uniform stroke so thah from beginning of the compression of every key the counter action of the lever is produced.

The invention will be best understood by referring she accompanying drawings forming a part of this specification and in which the key lever is shown in elevation.

As shown in the drawing a lever is pivotally "mounted under the keys a, the pivot 3) being situated approximately under the key 9. The end 0 of the lever is connected with the regulating Wheel d, its other free end 0 being curved so that all the keys a rest on the said lever. curved so that a concave convex long curve e extends under the keys 1 to 8, e second convex curve 7' being arranged at the part at the right of the key 9, the distance between the pivot of the lever and the axis of the key 9 being very short.

'l. A regulating device for the keys of calculating machines consisting of a lever pivotally mounted under the keys and consisting of two parts, one part being connected with the zero Wheel of the calculating machine, the other part of the lever being composed of one long concave convex curve extending under all the keys but one and of a steep convex curve situated under the extreme key all the keys resting upon said level.

2. A regulating device for the keys of col culating machines consisting of a lever pivotally mounted under Elie keys and consisting of two parts, one part being connected with the zero Wheel of the calculating ma;- chine, the other part of the lever being composed of one lon concave convert curve ex tending under 1% the keys but one and of a steep convex curve situated under the eX- i'reme key all the keys resting upon said lever, the distance between the pivot of the lever and the axis of said extreme key being very short.

The part c of the lever is In Witness whereof I have hereunto set my hand in the presence of two Witnesses.

HUGO CORDT.

Witnesses:

ALBnn'rUs BRAHMST, VEHELM STRUHR. 

